When did osce summit in astana take place? why did the president of kazakhstan decide to organize osce summit in astana? how many delegations attended the astana summit? when and where were the previous osce summits held?

1) It took place on December 1-2, 2010.
2) He decided to organize the summit in Astana to show the increasing role of Kazakhstan in the international arena.
3) It was attended by 73 official delegations.
4) The first CSCE Summit took place in Helsinki from 30 July-1 August 1975.
The second, was held in Paris in November 1990.
Five subsequent Summits were held in Helsinki (1992), Budapest (1994), Lisbon (1996), Istanbul (1999) and Astana (2010). 
7) Astana, 1-2 December 2010
6) Istanbul, 18-19 November 1999
5) Lisbon, 2-3 December 1996
4) Budapest, 5-6 December 1994
3) Helsinki, 9-10 July 1992
2) Paris, 19-21 November 1990
1) Helsinki, 1 August 1975